Power operated tool



S pt 26 J. CARNESECCA, JR., ETAL POWER OPERATED TOOL 3 Sheets-Sheet 1Filed Aug. 1, 1966 Joseph Camesecca, Jr. E gidio C. CameseccqfleceasedBY Bernice D. Carneseccafixecufnk INVENTORS 9 BY Wm...

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p 26, 1967 J. CARNESECCA, JR. ETAL POWER OPERATED TOOL 3 Sheets-Sheet 3Filed Aug. 1, 1966 llll wk g NE NE N2 \//Nr v5 mm N9 mm v9 NE JosephCarneseccmdn E giq/o C. Carnesecca, Deceased Y BerniceD.Carnesecca,xecufrix INVENTORvS BY and United States Patent 3,343,613POWER OPERATED TOOL Joseph Carnesecca, Jr., Springville, Utah, andEgidio C. Carnesecca, deceased, late of Springville, Utah, by Bernice D.Carnesecca, exeeutrix, Springville, Utah, assignors to New Draulics,Inc., a corporation of Utah Filed Aug. 1, 1966, Ser. No. 569,540 12Claims. (Cl. 173-169) ABSTRACT OF THE DISCLOSURE A power operated toolmounted at one end of an elongated tubular housing driven by a fluidoperated motor connected to the other end of the tubular housing. Thefluid motor and a flow control valve is connected to a handle throughwhich the entire tool assembly is manually supported. A -trigger mountedon the handle actuates the valve against a continuous fluid bias tocontrol bidirectional flow of fluid under pressure to the fluid motorthe output of which is transmitted by a drive shaft through the tubularhousing.

This application is a continuation-in-part of prior copendingapplication U.S. Ser. No. 224,631, filed Sept. 19, 1962, and relates topower operated tools. More particularly, the present invention pertainsto improvements in fluid power operated tools employing cutting elementssuch as saw chains and pruning shears.

One of the important improvements of the present invention, is toprovide a power operated tool assembly which features a handle portioncarrying both a fluid motor and a trigger operated valve mechanismconnected to remotely located cutting elements of the tool assembly bymeans of an elongated support housing. The construction and arrangementof the tool assembly is such as to enable interchange of parts in orderto change the length of the support housing for example or the type ofvalve.

Another important object of the present invention is to provide a fluidpower operated tool assembly having a valve mechanism which iscontinuously urged to a released position without the use of anysprings. Further, the valve mechanism is such as to control operation ofthe fluid motor whether it be of the piston type or the rotary type in asmooth, vibrationless manner avoiding coasting without use of anyexpensive and cumbersome brake mechanisms. Operation of the fluid motoris also made possible from any source of fluid under pressure availablefor example on a tractor, loader or hydraulic orchard'lift. The need forexpensive air compressors is thereby eliminated.

As a further object of the present invention, the tool assembly is lightin weight, simple in construction and easy to maneuver and adjust. Inone form of the tool assembly, handling of the tool is facilitated by anarmate grip portion mounting the trigger actuating mechanism from thevalve assembly and a conduit guide through which the fluid conduitsconnected to the valve assembly are relieved of any stress at theconnector fittings.

Additional objects of the present invention include the use of anelongated support housing the length of Which is selected as requiredincluding a drive transmitting shaft assembly featuring detachableconnectors and intermediate support facilities.

These together with other objects and advantages which will becomesubsequently apparent reside in the details of construction andoperation as more fully hereinafter described and claimed, referencebeing had to the accompanying drawings forming a part hereof, whereinlike numerals refer to like parts throughout, and in which:

3,343,513 Patented Sept. 26, 1967 FIGURE 1 is a top plan view of oneform of power operated tool constructed in accordance with the presentinvention.

FIGURE 2 is a side elevational view of the tool assembly shown in FIGURE1.

FIGURE 3 is an enlarged partial sectional view taken substantiallythrough a plane indicated by section line 33 in FIGURE 2.

FIGURE 4 is an enlarged partial sectional view taken substantiallythrough a plane indicated by section line 44 in FIGURE 1.

FIGURE 5 is a partial sectional View taken substantially through a.plane indicated by section line 5-5 in FIGURE 4.

FIGURE 6 is a partial sectional view taken substantially through a planeindicated by section line 6-6 in FIGURE 4.

FIGURE 7 is an enlarged partial sectional view taken substantiallythrough a plane indicated by section line 77 in FIGURE 2.

FIGURE 8 is a transverse sectional view taken substantially through aplane indicated by section line 88 in FIGURE 2.

FIGURE 9 is a side elevational view of another form of power operatedtool assembly.

FIGURE 10 is an enlarged side sectional view of a portion of the toolassembly shown in FIGURE 9.

FIGURE 11 is a top sectional view taken substantially through a planeindicated by section line 1111 in FIG- URE 10.

FIGURE 12 is a transverse sectional view taken substantially through aplane indicated by section line 1212 in FIGURE 10.

FIGURE 13 is a perspective view of a portion of the handle assemblyassociated with the power operated tool assembly shown in FIGURE 9.

FIGURE 14 is a perspective view of the valve body associated with thevalve assembly shown in FIGURES 10, 11 and 12.

FIGURE 15 is a partial side sectional view showing another form of valveassembly.

FIGURE 16 is a partial sectional View taken substantially through aplane indicated by section line 1616 in FIGURE 15.

FIGURE 17 is a perspective view of the valve body associated with thevalve assembly shown in FIGURES 15 and 16.

Referring now to the drawings in detail, FIGURES 1 and 2 illustrates oneform of power operated tool assembly in its entirety, which is generallyreferred to by reference numeral 10. The tool assembly includes a handleportion generally referred to by reference numeral 12 and a cutting toolportion 14 adjustably supported by an elongated support housing 16connected to the handle portion 12. Fluid is conducted to and from thetool assembly for operation thereof by means of a pair of conduits 18and 20. It will therefore be apparent that the tool assembly is held bythe operator at the handle portion 12 thereof while the cuttingoperation is performed at a location remote therefrom by means of thecutting tool portion 14 which is of the endless chain saw type as shownin FIGURES 1 and 2.

Referring now to FIGURES 1, 2 and 3, it will be observed that thecutting tool portion 14 includes an elongated guide blade 22 removablymounted on a swivel head 24 by means of the spaced fasteners 26 and 28and the slot 30. An endless saw chain 32 is entrained about the guideblade 22 and a drive sprocket wheel 34 splined to a shaft section 36projecting from an end portion 38 of the support housing 16. The endportion 38 includes a transversely projecting journal 40 on which theswivel head 24 is rotatably mounted for 360 angular movement about anaxis extending through the shaft section 36. The swivel head is heldassembled on the journal 40 by means of the thrust discs 42 and 44 andis angularly adjustable as shown for example by dotted line in FIGURE 2.Also, the swivel head encloses therewithin a lubricant reservoir forlubricating the saw chain 32 as it passes about the drive sprocket 34.

The shaft'section 36 to which the drive sprocket 34 is connected, isdriven through a right angle drive including the bevel gear 46 connectedto the shaft section 36 and journaled within the end portion 38 of thesupport housing by means of the bearing assembly 48. The bevel gear 46meshes with a bevel gear 58 journaled by the spaced bearing assembly 60within the end portion 38 of the housing at right angles to the shaftsection 36. The bevel gear 58 is connected by the coupling 62 to one endof a power transmitting drive shaft assembly 64 which extends throughthe tubular housing portion 66 associated with the support housing.

The drive shaft assembly 64 and the tubular portion 66 of the supporthousing are both replaceable so that different lengths thereof may beutilized in accordance with different requirements and desires. Where anextremely long drive shaft assembly 64 is utilized, it is composed of atleast two tubular sections 68 and 70 as shown in FIGURES 3, 4, and 7.The tool end of the tubular shaft section 70 is internally threaded soas to threadedly receive the threaded portion 72 of the coupling 62. Aball bearing 74 is held assembled between the tool end of the shaftsection 70 and a shoulder 76 on the coupling 62 for rotatably supportingthe drive shaft assembly at one end within the end portion 38 of thesupport housing. The

bearing 74 is held in concentric relation within the tool 'end of thetubular portion 66 of the housing by means of an annular, channel-shapedseating element 78. Similarly, the opposite drive end of the drive shaftassembly is rotatably supported within the tubular housing portion 66 bythe ball bearing 80 seated within an annular seating element 82. Thebearing 80 is held assembled between the shoulder 84 of a connector 86and the drive end of the tubular shaft section 68 which threadedlyreceives the connector 86. Intermediate support is also provided for thedrive shaft assembly by means of a ball bearing 88 as shown in FIGURE 7seated within an annular seating element 90 of resilient material suchas rubber, externally ribbed and frictionally held in engagement withthe internal surface of the tubular housing by the metallic sleeve 89.The bearing88 is held assembled between the adjacent ends of the tubularshaft sections 68 and 70 by means of the externally threaded connector90. Where a single shaft is used, the shaft may be externally knurled tohold the inner race of bearing 88 thereon with a force fit.

The drive end of the shaft assembly 64 is connected by the connector 86to the output shaft 92 of a rotary type of fluid motor 94 as shown inFIGURES 4 and 5. The fluid motor is enclosed within a motor body portion96 carried by the handle assembly and an end plate portion 98 having anaxial extension 100 clamped to the end of the tubular portion 66 of thesupport housing 16.

Also carried by the handle assembly, is a valve assembly generallyreferred to by reference numeral 102. The valve assembly is enclosed bya housing portion 104 of the handle assembly on the side of the fluidmotor 94 opposite the support housing 16. An arcuate grip portion 106 isconnected to the housing portion 104 and extends forwardly from thefluid motor 94 to a conduit guide portion 108. The conduit guide portiontherefore receives therethrough the fluid conduits 18 and 20 as shown inFIG- URE 8. The conduits are clamped to the guide portion 108 by meansof the clamp section 110 and the fastener 112 secured to the forward endof a spacer portion 114 connected to the housing portion 104 of thehandle assembly. The conduits 18 annd 20 are thereby aligned with theinlet and outlet passages 116 and 118 in the handle assem- 4 bly whichcommunicate with the fluid motor 94 as shown in FIGURE 6.

Fluid flow to and from the motor is controlled by means of the valveassembly 102 as aforementioned and toward this end a cylindrical opening120 is formed in the handle assembly overlapping the inlet and outletpassages 116 and 118 as shown in FIGURE 6 in order to establish fluidcommunication therebetween in bypass relation to the fluid motor. Thevalve assembly includes a valve body 122 sealingly received within theopening 120 to form a cavity 124 therewithin as shown in FIGURE 4 towhich the lower end of a reciprocable valve element 126 is exposed. Thevalve element 126 is displaceable within the bore 128 of the valve bodybetween a release position wherein a bypass passage is formed betweenthe fluid inlet and outlet passages 116 and 118 and an operatingposition in which the bypass passage is blocked so that fluid underpressure is routed through the fluid motor for operation thereof.

The valve element 126 is displaced from its release posi= tion to themotor operating position against the bias of fluid pressure in cavity124 by means of an actuating trigger element 130 pivotally mounted onthe arcuate grip portion 106 of the handle assembly, the trigger elementbeing connected to the valve element by the link element 132. Thetrigger element 130 is pivotally mounted by the pivot pin 134 as shownin FIGURE 2 so that it may extend forwardly therefrom below the handgripcovering 136 on the arcuate grip portion 106 for convenient manipulationby the operator. To operate the tool the trigger element 130 isangularly displaced in a clockwise direction as viewed in FIGURE 2 so asto downwardly displace the valve element 126 within the bore 128 to theoperating position blocking the bypass passage between the inlet andoutlet passages 116 and 118. Recirculation of fluid in bypass relationto the motor is thereby interrupted in order to operate the motor byrouting the fluid therethrough causing rotation of the motor outputshaft 92. The tool is thereby driven by the torque transmitted throughthe drive shaft assembly 64 and the right angle drive. When the triggerelement 130 is released, fluid under pressure displaces the valveelement 126 upwardly to its release position re-establishing fluidcommunication through the bore 128 of the valve body between the inletand outlet passages 116 and 118 in bypass relation to the motor. Themotor is thereby abruptly stopped without coast.

FIGURE 9 illustrates another power operated tool assembly constructed inaccordance with the present invention which is generally referred to byreference numeral 138. This tool assembly also includes a handle portion140 connected by the disconuectible connector assembly 142 to anelongated support housing portion 144 which mounts a pruning shears 146including the stationary blade 148 and the pivoted cutter blade 150. Anelongated pistonrod assembly (not shown) is therefore enclosed withinthe support housing 144 and is connected to a piston type motor enclosedwithin the handle assembly 140.

As shown in FIGURES 10, 11, 12 and 13, the handle assembly includes anouter tubular casing 152 within which the fluid piston motor is housedhaving externally threaded chamber portion 154. The motor chamber isthereby connected to a cylindrical handle body 156 by means of aninternally threaded end section 158. The handle body also includes afluid inlet passage 160 connected by the connecting passage -162 to thefluid chamber within the piston motor and an outlet passage 164. Inletand outlet conduits 166 and 168 are respectively connected to the inletand outlet passages by means of the fittings 170. Also formed in thehandle body 156 is a cylindrical opening 172 in fluid communication withboth the inlet and outlet passages 160 and'164. Thus, a bypass betweenthe inlet and outlet passages is established under control of the valveassembly 174. Valve actuating means consisting of a trigger leverelement 176 is 'piv otally mounted by the handle body 156. Toward thisend, the handle body is provided with a slot 178 intersected by a bore180 so that the mounting portion 182 of the trigger element may bereceived in the slot and be pivotally anchored to the body by a pin 184received through the bore 180. A threaded bore 186 is also formed in thehandle body intersecting the slot 178 as shown in FIG- URE so as tothreadedly receive an adjusting stop element 188 by means of which thetrigger element is limited in a counterclockwise direction to a positioncorresponding to the release position of the valve element 190associated with the valve assembly 174.

The valve assembly 174 is similar in construction and operation to thevalve assembly 102 associated with the tool assembly 10 of FIGURES 1through 8. The valve assembly 174 therefore also includes a valve body192 received within the cylindrical opening 172 so as to form a cavity194 therebelow to which the end 196 of the valve element is exposed.Accordingly, fluid under pressure supplied to the cavity 194 will exertan axial bias on the valve element 190 tending to displace it toward itsrelease position. The cavity 194 is therefore sealed by means of theO-ring seal 196 received within the annular groove 198 of the valve bodywhile the bore 200 extending through the valve body is sealed by theO-rings 202 within the axially spaced grooves 204 formed in the valveelement. The valve body is also formed with an inlet port or cutout 206which establishes communication between the bore 200 and the inletpassage 160. An outlet port or cutout 208 is also formed in the valvebody establishing fluid communication between the bore 200 and theoutlet passage 164. It will be observed from FIGURES 12 and 14, that theaxial length of the inlet port 206 is greater than that of the outletport 208 so that when the valve element 190 is displaced downwardly toits operating position, only the exhaust port 208 is closed and fluidcommunication between the bore 200 and the outlet passage 164interrupted. Thus, fluid under pressure supplied to the inlet passage160 will always be available to pressurize the cavity 194. Toward thisend, a passage 210 establishes fluid communication between the inletport 206 and the cavity 194 in order to assure that fluid under pressurewill be exerted at the lower end of the valve element in all positionsthereof. Thus, when the valve element 190 is displaced by the triggerelement 176 to its operating position as defined by the limit pin 212engaging the upper end 214 of the valve body, the exhaust port 208 isclosed so that fluid supplied to the inlet passage 160 will pressurizethe piston chamber. The piston (not shown) within the chamber is therebydisplaced causing movement of the pruning cutter blade 150 toward theend of its stroke. When movement of the piston is retarded or stopped bya load engaged with the blade 150, pressure increases. Since fluidcommunication is established between the inlet passage and the cavity194, any increase in pressure is communicated to the cavity so that whenoverload conditions occur, the force exerted on the piston element 190will be suflicient to displace it toward its release position. Thebypass passage through the bore 200 is thereby opened so as to unloadthe fluid piston motor.

It will be apparent from the description of the valve assembly 174illustrated in FIGURES 10, 11, 12 and 14, that it will control the flowof fluid for operation of either a piston type of fluid motor asdescribed in connection with FIGURES 9 through 14 or a rotary type ofgear pump motor such as described in connection with FIG- URES 1 through8 utilizing a continuously circulating fluid type of circuit. The poweroperated tools may however also be operated from a closed fluid circuitby replacing the valve assembly with a type such as illustrated inFIGURES 15, 16 and 17. For such an arrangement, the handle body 216within the tubular casing 218 of the handle assembly is provided withinlet and outlet passages 220 and 222 in fluid communication with thecylindrical 6 opening 224 within which the valve body 226 is received. Aconnecting passage 228 is also formed in the handle body between thecylindrical opening 224- and the piston chamber 230, axially spaced fromthe inlet passage 220. A spool type of valve element 232 is receivedwithin the bore 234 of the valve body so as to either interrupt orestablish fluid communication between the inlet port 236 and thecylinder pressure port 238 formed in the valve body in axially spaced,right angle relation to each other. The inlet port 235 is therefore incommunication with the inlet passage 220 while the pressure port 238 isin registration with the passage 228. Also formed on the valve body inrelation to the inlet port 236, is an exhaust recess 240 incommunication with the outlet passage 222. Thus, in the release positionof the spool valve element 232 as shown in FIGURE 15, the cylinderchamber 2350 is exhausted through the port 238, bore 234, recess 240 andoutlet passage 222. When the valve element 232 is displaced to itsoperating position, fluid communication is then established through thebore 234 between the inlet passage 220 and the pressure passage 238 forsupplying fluid under pressure to the cylinder chamber. The valve body226 is also provided with an annular groove 242 for receiving thesealing ring 244. This type of valve assembly could also be utilized inconjunction with a closed fluid circuit for tool .assemblies having arotary type of fluid motor.

The foregoing is considered as illustrative only of the principles ofthe invention. Further, since numerous modifications and changes Willreadily occur to those skilled in the art, it is not desired to limitthe invention to the exact construction and operation shown anddescribed, and accordingly all suitable modifications and equivalentsmay be resorted to, falling within the scope of the invention asclaimed.

What is claimed as new is as follows:

1. In combination with a fluid pressure operated device, a handleassembly having inlet and outlet passages connected to said device andvalve means mounted by the handle assembly for controlling circulatoryflow of fluid under pressure to said device comprising, a valve bodybeing mounted by the handle assembly having a bore through whichcontinuous fluid communication is established between said inlet passageand the fluid pressure operated device, a valve element mounted formovement within said bore of the valve body, actuating means mounted bythe handle assembly and engageable with the valve element fordisplacement thereof from a release position to an operating positionestablishing bidirectional flow of fluid under pressure to and from thefluid pressure operated device, and fluid pressure means connected tothe bore of the valve body for continuously urging the valve elementtoward said release position preventing said bidirectional flow.

2. In combination with a fluid pressure operated device, a handleassembly having inlet and outlet passages connected to said device andvalve means mounted by the handle assembly for controlling flow of fluidunder pressure to said device comprising, a valve body having a boreextending therethrough, said valve body being received within an openingformed in the handle assembly communicating with said inlet and outletpassages, a valve element mounted for movement within said bore of thevalve body, actuating means mounted by the handle assembly andengageable with the valve element for displacement thereof from arelease position to an operating position producing flow of fluid underpressure to the fluid pressure operated device, and fluid pressure meansfor urging the valve element toward said release position, said valvebody including inlet and outlet ports establishing fluid communicationbetween the inlet and outlet passages through said bore, only the outletport being closed by the valve element in the operating positionthereof, said fluid pressure means including a cavity formed in saidopening by the valve body to which the valve element is exposed throughthe bore, and passage means in the valve body continuously connectingthe inlet passage to the cavity for pressurization thereof.

3. The combination of claim 2 including means engageable with the valvebody for limiting movement of the valve element to said operatingposition.

4. The combination of claim 3 wherein said actuating means comprises atrigger element pivotally mounted by the handle assembly in alignmentwith the valve element, and adjustable stop means limiting displacementof the trigger element by the valve element to the release position.

5. The combination of claim 1 wherein said handle assembly includes anarcuate grip portion connected to the fluid pressure operated device,and guide means mounted by the grip portion in spaced alignment with thevalve body for supporting a pair of conduits connected to the inlet andoutlet passages.

6. The combination of claim 2 wherein said fluid pressure operateddevice includes, a fluid motor connected to the handle assembly, a poweroperated tool, tubular support means connected to the fluid motor formounting the tool remotely spaced from the handle assembly, and powertransmitting means enclosed within the tubular support means fordrivingly connecting the fluid motor to the tool.

7. The combination of claim 6 wherein said tubular support meansincludes a transversely extending end portion, and swivel meansrotatably mounting the tool on the end portion for 360 angular movement,said power transmitting means including an angle gear drive mounted inthe end portion of the support means and connected to the tool and anelongated drive shaft connecting the fluid motor to the angle geardrive.

8. The combination of claim 7 wherein said elongated drive shaftincludes at least two tubular sections having adjacent, internallythreaded portions, bearing means axially spacing said sections inconcentric relation to each other, ,an annular seating element withinthe tubular support means positioning the bearing means therewithin, andconnector means threadedly received in the internally threaded portionlocking the bearing means in assembled relation between the tubularsections.

9. In combination with a fluid pressure operated device, a handleassembly connected to said device, valve means mounted by the handleassembly for controlling the flow of fluid under pressure to saiddevice, actuating means mounted by the handle assembly and engageablewith the valve element for displacement thereof from a release position,a power operated tool, tubular support means connected to the fluidoperated device for mounting the tool remotely spaced from the handleassembly and an elongated drive shaft enclosed within the tubularsupport means drivingly connecting the fluid operated device to thetool, including at least two tubular sections having adjacent internallythreaded portions, bearing means axially spacing said sections inconcentric relation to each other, an annular seating element within thetubular support means positioning the bearing means therewithin, andconnection means threadedly received in the internally threaded portionlocking the bearing means in assembled relation between the tubularsections.

10. In combination with a fluid pressure operated device, a handleassembly having inlet and outlet passages connected to said device andvalve means mounted by the handle assembly for controlling the flow offluid under pressure to said device comprising, a valve body having abore extending therethrough, said valve body being received within anopening formed in the handle assembly communicating with said inlet andoutlet passages, a valve element mounted for movement within said boreof the valve body, actuating means mounted by the handle assembly andengageable with the valve element for dis placement thereof from arelease position, said fluid pressure operated means including a fluidmotor connected to the handle assembly, a power operated tool, tubularsupport means connected to the fluid motor for mounting the toolremotely spaced from the handle assembly and power transmitting meansenclosed within the tubular support means for drivingly connecting thefluid motor to the tool, said tubular support means including atransversely extending end portion, and swivel means rotatably mountingthe tool on the end portion for 360 angular movement, said powertransmitting means including an angle gear drive mounted in the endportion of the support means and connected to the tool, and an elongateddrive shaft connecting the fluid motor to the angle gear drive, saidelongated drive shaft including at least two tubular sections havingadjacent, internally threaded portions, bearing means axially spacingsaid sections in concentric relation to each other, an annular seatingelement within the tubular support means positioning the bearing meanstherewithin, and connector means threadedly received in the internallythreaded portion locking the hearing means in assembled relation betweenthe tubular sections.

11. The combination of claim 9 wherein said handle assembly includes anarcuate grip portion mounted by the fluid pressure operated device, andguide means connected to the grip portion in spaced alignment with thevalve body for supporting a pair of conduits connected to the inlet andoutlet passages.

12. In a fluid pressure operated device having an inlet and an outletpassage, a flow controlling valve assembly comprising, a valve bodyhaving a bore extending therethrough, said valve body being receivedWithin an opening formed in the device and communicating with said inletand outlet passages, a valve element mounted for movement within saidbore of the valve body, actuating means mounted by the handle assemblyand engageable with the valve element for displacement thereof from arelease position to an operating position producing flow of fluid underpressure to the fluid pressure operated device, fluid pressure means forurging the valve element toward said release position, said valve bodyincluding inlet and outlet ports establishing fluid communicationbetween the inlet and outlet passages through said bore, only the outletport being closed by the valve element in the operating positionthereof, a cavity formed in said opening by the valve body to which thevalve element is exposed through the bore and passage means in the valvebody continuously connecting the inlet passage to the cavity forpressurization thereof.

References Cited UNITED STATES PATENTS 2,372,942 4/1945 Fischer et a1.4l451 2,612,140 9/1952 Miller 173169 2,703,928 3/1955 Southwick 143-323,097,022 7/1963 Sernety 308-184 3,099,135 7/1963 Hoadley 173169 FRED C.MATTERN, JR., Primary Examiner.

L. P. KESSLER, Assistant Examiner.

1. IN COMBINATION WITH A FLUID PRESSURE OPERATED DEVICE, A HANDLEASSEMBLY HAVING INLET AND OUTLET PASSAGES CONNECTED TO SAID DEVICE ANDVALVE MEANS MOUNTED BY THE HANDLE ASSEMBLY FOR CONTROLLING CIRCULATORYFLOW OF FLUID UNDER PRESSURE TO SAID DEVICE COMPRISING, A VALVE BODYBEING MOUNTED BY THE HANDLE ASSEMBLY HAVING A BORE THROUGH WHICHCONTINUOUS FLUID COMMUNICATION IS ESTABLISHED BETWEEN SAID INLET PASSAGEAND THE FLUID PRESSURE OPERATED DEVICE, A VALVE ELEMENT MOUNTED FORMOVEMENT WITHIN SAID BORE OF THE VALVE BODY, ACTUATING MEANS MOUNTED BYTHE HANDLE ASSEMBLY AND ENGAGEABLE WITH THE VALVE ELEMENT FORDISPLACEMENT THEREOF FROM A RELEASE POSITION TO AN OPERATING POSITIONESTABLISHING BIDIRECTIONAL FLOW OF FLUID UNDER PRESSURE TO AND FROM THEFLUID PRESSURE OPERATED DEVICE, AND FLUID PRESSURE MEANS CONNECTED TOTHE BORE OF THE VALVE BODY FOR CONTINUOUSLY URGING THE VALVE ELEMENTTOWARD SAID RELEASE POSITION PREVENTING SAID BIDIRECTIONAL FLOW.